Percocet contains oxycodone, a Schedule II controlled substance. As an opioid, Percocet exposes users to the risks of addiction, abuse, and misuse [see DRUG ABUSE AND DEPENDENCE]. Although the risk of addiction in any individual is unknown, it can occur in patients appropriately prescribed Percocet.
Use a waterpik! It is a miracle for cleaning under the gumline and in between teeth. You'll actually smell that awful smell coming out, but do it 2x a day and it'll fix that kind of odor. Don't forget, it doesn't replace flossing. All pharmacies and walmart, etc sell them.
One of the major types of problems related to taste and smell is distortion of function. It seems that you have distortion of function called parosmia which means that foods or odors that normally are pleasant may taste or smell odd or distorted. In your case, you experience an unpleasant chemical taste and smell. This faulty sense of smell and taste can relate to several causes.